Manufacture of electrical resistances.



A. W. MALEY.

MANUFAGTURE F ELECTRICAL RESISTANCES.

man@ @13.24., 1914,

APRLICATION FLED OGT. 8, 1910.

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Y necessitates the use of a very considera -nary state, but this diilicultyfmej' ALFRED WALTER: 'W'ss'r n rmwicn, nNiLANn..

MANUFACTRE OF ELECTRICAL BVESISTANGES.,

peni cation of Letters Patent.

.Patented Feb. 24, 191A.

, Application file'l @eten-i Sll. Serial No, 586,030'.`

4 -I .,l To a ll u vhomzt may concern:

Be .1t known that L, A Livrrn Vilar" Manny; a subject ofthe King of'. C ain, residing ,at 200 Feeehes r Bromwich, in the county of Si England, have invented new and ns' .i provenientsin the Manufacture of Eleetrioel Resistances, of which oiiowii specification,

The invention relates to efieetricel i'ef` ances such as starting resiste for motors, regulating resist-ences for' for all those purposes where type is advantageous .These resistanees e now commonly Inadejn the `et e' which. have as a rule been east in isola cast gfrids are fragile and on account o irre'giilarities 'inseparabile from east nia are unreliable. Recently Vgrids have stamped 'out ofv sheet mild steelV to avoi objection of nnreliability, but the in' thus 'made are inconvenient besan small specific resistance oi? the mild Lne use oi; this number of grids which occupy a space and increase the possibilit@v oi'- h'ffeakdow joints.v The use ofthe resistant alleys ai readyv known is hindered by their li this difficulty being accentuated by f that resistances of such alloys 'would li to be of considerable'section in ov der to -Y the large currents employed wi 'sit nndne heatinff.

According to the present inv-enti or iron containing a high. percentage bon is employed for the resi terial having a resistance approa of thenast iron hitherto used, this kind is herd and therein sections very diiiicult to Work come in several waye.

Inv the first place, the steel may be neef in the form of Wire of any convenient seetifn. This Wire may bebent when hot inte forni of a grid'bnt itis somewhat diie to maintain the-necessariT heating' 'lnstfwfi of Winding the material hotT Wire oi? steel .may be Wound or a seit steel pl be stamped into the form ot tl this material may then ha bonization by the Weil knot-*n process hardening. Of course, the harden' fected not for its own salie but the increase in specific resistanceu from the addition of carbonI succession oil grids to nionnt in a iframe. mamut., ire may be adopted W'ithalnyllnatei'ial @manie/off being foin'ied' or stamped. j,

.Tn the di i y torni et resistance grid constructed in ir, iignre i is a front elevation.

@alan While liv. 3 is a side elevaeeen other by insulating is!" Wa ie oolts el) are clamped at then- 'e neln's' of nuts to a pair of parallel T' qu i: sistsnee is formed it is not i. n adhere to the grid type, al-

'ttiis is the best known and'is very Instead the Wire or rod can'be in coils, but this has the disadvantage tlist one end is-in the middle; Flat coils be formed in kanother way" by l' thestrip over a-sheet, which avoids "Hivernage, tie sheet being removed 1 yes snfonnded-hy air. coils may be mounted in the same way fwn type of .in stainpiiieuthe grids d iflieultjy7 is en only; red in the inet that the strength necr the, stamping' tool determines its nd this again determines the size of g); between successive turns' of the This becomes particularly important E. l prod-fled bent iiponitseif se as to make the- 4 obviously this method ,of

,Wings in which 'is illustrated' is employed, o-f grooten" thickness 1s fomore subsantlal tool becomes To ovez'come this dculty the :L simple snuous 13,1 4b) which will allowY of 'the use lv large ools even for the stampmay be stamped as ,l thiol; of luu'd ma'erlal, strong "wedge-shaped ool may ol botvoen. 'the 5ml@ Smuom tup im fen nmoral of higher specific ress'umoo ing terminal. loops come' means and ermual comme being arranged side by side and forming' 'parallel the adjacent units by means of szal'fl @vimiml loops.

3. i continuous inte`4 ,A a, suo/nession of loops and beni; upon i .lni'elmls io crmsx'ino :L compact of patrollel 'uing attuclllng;

gldg conneoeyl at 'their ends to pio Vido, Si'

nod my it OE.

EDMUND l zong and the units 

